Malicious PDF — malware analysis report

Static analysis result for SHA-256 225f8761a7344a2b…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 15:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9134e4b641ead7d2d011fb20bc07d1e5 SHA-1: e7bf11c162197e5f26c846e4dd40226aa087f7d1 SHA-256: 225f8761a7344a2bbc051663aa7ff6f91c905a7a7cb218a45e2781b159b380d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits PDF vulnerabilities. The presence of numerous links pointing to various domains, including compromised CMS uploads and disposable hosting, suggests a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.kilincsweb.hu/fileok/file/sagalewepelatujube.pdf In PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/zorefanoraxizimaned.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/9262460756.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/f7e8765ca5268665d762dd9aa0f9cfdf/vanuril.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/budoputiwele.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/12677701318.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9d491304---77749375594.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ffda9c2b2abc907a0ee11fb83030fba6/26671081912.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/srci331i93a12l0dkg1d8phmro/surolaxisulakatozodo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4df558892---5409833984.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbf0df253d---1405386444.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc31cf53da1---xetewevojovuzumejelukorod.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/iqjra26imcc502s0jihjimhhan/sukiwupuxojuwidapepud.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/lsetnhmotm3r342jcqlla5rgb3/23175440135.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e138todre3t8639ldghfj6u72/70714692322.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/nugovukefitebagubovuti.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/dozus.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdd24a7478---77869828237.pdfIn PDF document text
    • https://penzion-palice.cz/content/551026379.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/65087062248.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/97364801574.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210815031955_1010366541.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62f0a2a972---26583867711.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/8754766147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=american+civil+war+map+worksheetPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 17284 bytes
SHA-256: b8403979f448d2bdb3808947bde90db507fc1fd3245578d38899dd9d8a5f82e3
font_02_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 10864 bytes
SHA-256: 103fee5e068a8dad51459e0b0a7b4bf9081701b75b443648862f0b9afcb61b1b